Kotlin Facet: Reset all coroutine support flags before importing them frm Gradle

idea/src/org/jetbrains/kotlin/idea/facet/facetUtils.kt

@@ -231,11 +231,16 @@ fun parseCompilerArgumentsToFacet(arguments: List<String>, defaultArguments: Lis
         commonCompilerArguments.coroutinesWarn = false
         commonCompilerArguments.coroutinesError = false
 
+        if (compilerArguments != commonCompilerArguments) {
+            compilerArguments.coroutinesEnable = false
+            compilerArguments.coroutinesWarn = false
+            compilerArguments.coroutinesError = false
+        }
+
         parseArguments(argumentArray, compilerArguments, true)
 
-        if (!compilerArguments.coroutinesEnable && !compilerArguments.coroutinesWarn && !compilerArguments.coroutinesError) {
-            compilerInfo.coroutineSupport = oldCoroutineSupport
-        }
+        val restoreCoroutineSupport =
+                !compilerArguments.coroutinesEnable && !compilerArguments.coroutinesWarn && !compilerArguments.coroutinesError
 
         versionInfo.apiLevel = LanguageVersion.fromVersionString(compilerArguments.apiVersion)
         versionInfo.languageLevel = LanguageVersion.fromVersionString(compilerArguments.languageVersion)
@@ -268,5 +273,9 @@ fun parseCompilerArgumentsToFacet(arguments: List<String>, defaultArguments: Lis
         }
 
         copyInheritedFields(compilerArguments, commonCompilerArguments)
+
+        if (restoreCoroutineSupport) {
+            compilerInfo.coroutineSupport = oldCoroutineSupport
+        }
     }
 }

idea/tests/org/jetbrains/kotlin/idea/codeInsight/gradle/GradleFacetImportTest.kt

@@ -109,6 +109,54 @@ class GradleFacetImportTest : GradleImportingTestCase() {
         }
     }
 
+    @Test
+    fun testFixCorruptedCoroutines() {
+        createProjectSubFile("build.gradle", """
+            group 'Again'
+            version '1.0-SNAPSHOT'
+
+            buildscript {
+                repositories {
+                    mavenCentral()
+                    maven {
+                        url 'http://dl.bintray.com/kotlin/kotlin-eap-1.1'
+                    }
+                }
+
+                dependencies {
+                    classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.0-beta-38")
+                }
+            }
+
+            apply plugin: 'kotlin'
+
+            dependencies {
+                compile "org.jetbrains.kotlin:kotlin-stdlib:1.1.0-beta-38"
+            }
+
+            kotlin {
+                experimental {
+                    coroutines 'enable'
+                }
+            }
+        """)
+
+        importProject()
+
+        with (facetSettings) {
+            compilerInfo.k2jvmCompilerArguments!!.coroutinesEnable = true
+            compilerInfo.k2jvmCompilerArguments!!.coroutinesWarn = true
+            compilerInfo.k2jvmCompilerArguments!!.coroutinesError = true
+
+            importProject()
+
+            Assert.assertEquals(CoroutineSupport.ENABLED, compilerInfo.coroutineSupport)
+            Assert.assertEquals(true, compilerInfo.k2jvmCompilerArguments!!.coroutinesEnable)
+            Assert.assertEquals(false, compilerInfo.k2jvmCompilerArguments!!.coroutinesWarn)
+            Assert.assertEquals(false, compilerInfo.k2jvmCompilerArguments!!.coroutinesError)
+        }
+    }
+
     @Test
     fun testCoroutineImportByProperties() {
         createProjectSubFile("gradle.properties", "kotlin.coroutines=enable")